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Malware writers turn to zero-hour viruses

Small stealthy attacks flying under the corporate radar

Criminal virus writers are turning away from large-scale exploits and are
coding so-called 'zero-hour malware' that can quietly fly under the radar of
corporate IT security systems, experts warned today.

According to the latest
ScanSafe
Global Threat Report on web filtering, viruses increased 13 per cent in June and
the company blocked more than 300 unique web viruses during the month.

"In the past few months, we have not seen massive, headline-grabbing
outbreaks. But we have seen a steady stream of low-volume viruses designed to
exploit the time between the initial appearance of a virus and the release of an
antivirus signature.

"By leveraging these zero-hour threats, virus writers can strike when users
without real-time threat protection are most vulnerable and fly 'under the
radar' until an antivirus signature is released."

The report warned that zero-hour malware represents one of the most
significant security threats to corporate networks because they go undetected by
the vast majority of security technologies.

ScanSafe reported a surge in intercepts of the Exploit.JS.CVE-2005-1790.j
(Troj/Onladv-A),
a downloader Trojan that affects Microsoft Windows.

The malware exploits the ONLOAD vulnerability associated with certain
versions of Internet Explorer to download and execute a file from a remote
website.